Câu hỏi: A hydroelectric dam ______________ in this area now.

A. is building

B. is being built

C. build

D. was built

Câu 1: Express Money Transfer is one of the quickest ways ……..help us to send money.

A. who

B. whose

C. when

D. that

Câu 2: People are destroying the air by adding ...... to it.

A. pollutants

B. polluters

C. pollution

D. polluted

Câu 3: The waste from the chemical factory is extremely .......

A. harm

B. harmful

C. unharmed

D. harmless

Câu 4: What about ___________ the solution together this afternoon?

A. find

B. finding

C. to find

D. to finding

Câu 5: The campaign will hopefully ensure the survival ...... the tiger.

A. of

B. for

C. to

D. on

Câu 6: I would like to send these letters …………………..air mail.

A. in

B. with

C. by

D. over